Topic: JMR billet engine build

[Syscrush]

This thing looks very cool! I've been thinking of a data logging lambda sensor for a while for similar reasons. I'm taking a very hard look at this:

http://www.zeitronix.com/Products/zt2/zt2.shtml

Thanks for the pointer.

[Don R]

 My drag car has a racepack data recorder on a 567" big block and at lower rpm's reversion will suck air back into the header between pulses and make spikes on the data recorder. crazy.

[MRieck]

My drag car has a racepack data recorder on a 567" big block and at lower rpm's reversion will suck air back into the header between pulses and make spikes on the data recorder. crazy.

Flow does go in both directions. I am porting a CBX head which has....possibly....the worst ports I have seen. The most lateral ports on 1 & 6 can't be seen from the intake side which made me think they probably push more air through the port than pull it.

[Syscrush]

I am porting a CBX head which has....possibly....the worst ports I have seen. The most lateral ports on 1 & 6 can't be seen from the intake side which made me think they probably push more air through the port than pull it.

It really is interesting the design compromises made on that bike! And it's interesting that they did so much wrong but still managed to come up with the first 100hp production bike. Was it the first widely-available 4-valve head?

How badly is the flow mismatched between the different cylinders? I'd be really curious about how it looks with the carbs and airbox on, as I think the intake trumpets in the airbox are shorter on the outboard cyls to compensate for the longer runner length.